000 00306nam a2200121Ia 4500
008 160122s9999 xx 000 0 und d
041 _aEnglish
100 _aWilliam Shay
245 _aUnderstanding Data Communication and Networks
260 _bDelhi:Books Com
_c1999
300 _a711p.
650 _aElectronic
999 _c675
_d675